Flags

Attribute flags for UFunction and their purpose

Function Flag	Effect
BlueprintAuthorityOnly	This function will only execute from Blueprint code if running on a machine with network authority (a server, dedicated server, or single-player game).
BlueprintCallable	The function can be executed in a Blueprint or Level Blueprint graph.
BlueprintCosmetic	This function is cosmetic and will not run on dedicated servers.
BlueprintEvent	This function is designed to be overridden by a Blueprint, but also has a default C# implementation.
BlueprintPure	The function does not affect the owning object in any way and can be executed in a Blueprint or Level Blueprint graph. [UFunction(FunctionFlags.BlueprintPure)] public int BlueprintPureFunction() { return 1; } [UFunction(FunctionFlags.BlueprintCallable)] public int BlueprintCallableFunction() { return 1; } Pure functions do not cache their results, therefore you should be cautious when doing any non-trivial amount of work with a blueprint function. It is good practice to avoid outputting array properties in Blueprint pure functions.
Client	The function is only executed on the client that owns the Object on which the function is called.
Exec	The function can be executed from the in-game console. Exec commands only function when declared within certain Classes.
NetMulticast	The function is executed both locally on the server, and replicated to all clients, regardless of the Actor's NetOwner.
Reliable	The function is replicated over the network, and is guaranteed to arrive regardless of bandwidth or network errors. Only valid when used in conjunction with Client or Server.
Server	The function is only executed on the server.

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